Induction cooktops are really cool: you can precisely control the temperature; they are safer because only cookware gets hot, they are faster, save energy and you can clean them easily. But they not only offer cool advantages, they are also a little bit capricious and won’t work if you don’t use the right cookware.
This became such a problem to cookware manufacturers –but let’s call it challenge, it sounds better-, who have had to make their products suitable for induction. It has not been always easy, especially to aluminium cookware manufacturers. Luckily, induction pans can also be used in all other cooking surfaces, so if you think you will buy an in induction cooktop someday, maybe start buying induction cookware is not a bad idea to save yourself renewing all your cookware at the same time.
The material in contact with the hob must be magnetic to make cookware suitable for induction cooktops. But aluminium and stainless steel –the most common cookware manufacturing materials– doesn’t have this attribute. For this reason it is necessary to unify them with any material with inductive capacity such as ferritic steel. It looks easy, isn’t it? Let’s paste ferritic steel sheet in the base and done! Well, I’m afraid not. For example: to unify aluminium with ferritic steel cookware manufacturers must overcome two main difficulties –also known as challenges-:
First one is ferritic steel and aluminium have different thermal expansions, which means they change their dimensions in different proportions when temperature changes. And this is a problem –or challenge- because heat is something you will definitely need to cook. Second one is corrosion, which makes very difficult to “paste” both materials.
Both challenges make very difficult to unify these materials in a secure and effective way and create heat efficient pans at the same time. There are some different systems but not all them have the same good performance. Castey uses the Full Induction system, which not only works very well in all brands induction cooktops but also have a great energy efficiency.